Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbab2b2cc51b84b2…

MALICIOUS

PDF

96.4 KB Created: 2021-08-24 12:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e6bc88d31fecb7ee6026ea5767bc98d SHA-1: 0be67bbf2e5e9e47d472be7b568ace2c076ceb8d SHA-256: cbab2b2cc51b84b2892800694f1689740dc44603b9cbb24ba9f9a09ee3ef0493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e75d30e5f---29878600476.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/es9truq3662b4jut54uvme27k6/xopunon.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e474b648d6---32631143388.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/38242759527.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9f8d1e86---viferegotafapufebix.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/fudoxovoletutimapano.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/13111051473.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ia1mhe4g4dcp7gcngass1miit2/kamifaraf.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5362da66---82273579764.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/9894629685.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/867657601.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/7508365616.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-17/20210817061226789564.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca869ef0a0---39035764673.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/kobop.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/40164509482.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/75048553800.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a523dce8185---tekofigoterekegis.pdfIn PDF document text
    • https://goodline.by/userfiles/file/93220040457.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4dcd23def---gojuvudu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/30233708463.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/27475164374.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/22340364652.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/20162541118.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7816df96f---namapuzoli.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/muted.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=begged+reported+speechPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 10440 bytes
SHA-256: 904c5883743120ef786c9969d5eb31dc100677687651d8b36c9140320cfaa091
font_01_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 19928 bytes
SHA-256: afcd940aaecf22cb23402927b05fe20df390b87cf0b710a59234385e66a5d26e
font_02_sfnt_off00015bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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